Benitez has made it clear to Blues owner Roman Abramovich he needs urgent reinforcements during the remaining few days of the transfer window or risk meltdown.
He said: “We cannot rest too many players because our squad is not that big in certain positions.
“I had a good conversation about this with the owner the other day. I gave my opinion, he listened to me. But I have to concentrate on the team.
“I have to play Frank Lampard and Ramires all the time because we have problems with injuries and suspensions and we have two players at the African Nations Cup.
“We have had nine games a month since I came here and the players are a little tired.
“You can really see the difference when players are allowed to have a rest.
“This season we have had to play extra games in Japan and Monaco. We have players at the African Nations Cup and we’ve had to cope with injuries to Lampard, Terry and Romeu.”